spark plug holes

[FatBoyKuztoms]

What size drill bit do I use to make spark plug holes for the spark plug boots?

[Ramfins59]

Try a #76.

[espo]

That may depend on the size of your spark plug wires. There are many different ideas on this , but what I have done is using a prewired distributor I'll drill the head for the diameter wire supplied with the distributor. The Parts by Parks distributors that I usually use the wire is about 0.21 or a number 75 drill. I use the supplied tubing to cut what looks like a spark plug boot and slid over the end of the wire after cutting the wire to length before gluing the wire into the head. The detail is small enough that to my eye it looks like a spark plug covered by the boot. I'm sure there are others here that my have other options for you. I'll also save the spark plug wires that are cut shorter for other detailing as needed. Hope this helps.